"mastoid" in the noun sense
1. mastoid, mastoid process, mastoid bone, mastoidal
process of the temporal bone behind the ear at the base of the skull
"mastoid" in the adjective sense
of or relating to or in the region of the mastoid process
2. mastoid, mastoidal
relating to or resembling a nipple
Source: WordNet® (An amazing lexical database of English)
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